<template>
  <div class="login">
    <el-form ref="loginForm" :model="loginForm" :rules="loginRules" class="login-form">
      <h3 class="title">若依后台管理系统</h3>
      <el-form-item prop="username">
        <el-input
          v-model="loginForm.username"
          type="text"
          auto-complete="off"
          placeholder="账号"
        >
          <svg-icon slot="prefix" icon-class="user" class="el-input__icon input-icon"/>
        </el-input>
      </el-form-item>
      <el-form-item prop="password">
        <el-input
          v-model="loginForm.password"
          type="password"
          auto-complete="off"
          placeholder="密码"
          @keyup.enter.native="handleLogin"
        >
          <svg-icon slot="prefix" icon-class="password" class="el-input__icon input-icon"/>
        </el-input>
      </el-form-item>
      <el-form-item prop="code" v-if="captchaOnOff">
        <el-input
          v-model="loginForm.code"
          auto-complete="off"
          placeholder="验证码"
          style="width: 63%"
          @keyup.enter.native="handleLogin"
        >
          <svg-icon slot="prefix" icon-class="validCode" class="el-input__icon input-icon"/>
        </el-input>
        <div class="login-code">
          <img :src="codeUrl" @click="getCode" class="login-code-img"/>
        </div>
      </el-form-item>
      <el-checkbox v-model="loginForm.rememberMe" style="margin:0px 0px 25px 0px;">记住密码</el-checkbox>
      <el-form-item style="width:100%;">
        <el-button
          :loading="loading"
          size="medium"
          type="primary"
          style="width:100%;"
          @click.native.prevent="handleLogin"
        >
          <span v-if="!loading">登 录</span>
          <span v-else>登 录 中...</span>
        </el-button>
        <div style="float: right;" v-if="register">
          <router-link class="link-type" :to="'/register'">立即注册</router-link>
        </div>
      </el-form-item>
    </el-form>
    <!--  底部  -->
    <div class="el-login-footer">
      <span>Copyright © 2018-2022 zxpCopy All Rights Reserved.</span>
    </div>
  </div>
</template>

<script>
  import { getCodeImg } from '@/api/login'
  import Cookies from 'js-cookie'
  import { encrypt, decrypt } from '@/utils/jsencrypt'
//  encrypt 加密  decrypt 解密
  export default {
    name: 'Login',
    data() {
      return {
        codeUrl: '',
        loginForm: {
          username: 'admin',
          password: 'admin123',
          rememberMe: false,
          code: '',
          uuid: ''
        },
        loginRules: {
          username: [
            { required: true, trigger: 'blur', message: '请输入您的账号' }
          ],
          password: [
            { required: true, trigger: 'blur', message: '请输入您的密码' }
          ],
          code: [{ required: true, trigger: 'change', message: '请输入验证码' }]
        },
        loading: false,
        // 验证码开关
        captchaOnOff: true,
        // 注册开关
        register: false,
        redirect: undefined
      }
    },
    watch: {
      $route: {
        handler: function(route) {
          this.redirect = route.query && route.query.redirect
        },
        immediate: true
      }
    },
    created() {
      this.getCode()
      this.getCookie()
    },
    methods: {
      getCode() {
        getCodeImg().then(res => {
          this.captchaOnOff = res.captchaOnOff === undefined ? true : res.captchaOnOff
          if (this.captchaOnOff) {
            this.codeUrl = 'data:image/gif;base64,' + res.img
            this.loginForm.uuid = res.uuid
          }
        })
      },
      getCookie() {
        const username = Cookies.get('username')
        const password = Cookies.get('password')
        const rememberMe = Cookies.get('rememberMe')
        this.loginForm = {
          username: username === undefined ? this.loginForm.username : username,
          // 这里就对加入cookie的密码进行了解密
          password: password === undefined ? this.loginForm.password : decrypt(password),
          rememberMe: rememberMe === undefined ? false : Boolean(rememberMe)
        }
      },
      handleLogin() {
        this.$refs.loginForm.validate(valid => {
          if (valid) {
            // loading的使用
            // loading可以实现的效果
            // 在请求的数据没有返回时，实现加载的效果。原始的效果是比较简单的蓝线圆的转动，但是可以通过CSS改变它的样式，比如这样的
            this.loading = true
            // 如果用户选择记住密码，把数据记载到cookie里面
            if (this.loginForm.rememberMe) {
              Cookies.set('username', this.loginForm.username, { expires: 30 })
              Cookies.set('password', encrypt(this.loginForm.password), { expires: 30 })
              Cookies.set('rememberMe', this.loginForm.rememberMe, { expires: 30 })
            } else {
              // 否则直接移除用户信息
              Cookies.remove('username')
              Cookies.remove('password')
              Cookies.remove('rememberMe')
            }
            // Vuex中this.$store.commit() 和 this.$store.dispatch() 方法的区别
            // 两个方法其实很相似,关键在于一个是同步,一个是异步
            // commit: 同步操作
            // this.$store.commit('方法名',值) //存储
            // this.$store.state.'方法名' //取值
            // dispatch: 异步操作
            // this.$store.dispatch('方法名',值) //存储
            // this.$store.getters.'方法名' //取值
            // 当操作行为中含有异步操作,比如向后台发送请求获取数据,就需要使用action的dispatch去完成了,其他使用commit即可.
            // 其他了解：
            // commit => mutations, 用来触发同步操作的方法.
            // dispatch => actions, 用来触发异步操作的方法.
            // 在store中注册了mutation和action
            // 在组件中用dispatch调用action,用commit调用mutation
            // 这里并没有直接调用api里面的login方法
            // 而是使用了store里面的方法
            this.$store.dispatch('Login', this.loginForm).then(() => {
            // alert(this.loginForm.uuid)
            // alert("调用了Login")
            // 1、作用：this.$router.push() 可以通过修改url实现路由跳转。
            // 2、push 后面可以是对象，也可以是字符串：
            // // 字符串
            // this.$router.push('/home/first')
            // // 对象
            // this.$router.push({ path: '/home/first' })
            // // 命名的路由
            // this.$router.push({ name: 'home', params: { myid: id }})
              this.$router.push({
                path: this.redirect || '/'
              }).catch(() => {
                alert("登陆失败")
              })
            }).catch(() => {
              this.loading = false
              if (this.captchaOnOff) {
                this.getCode()
              }
            })
          }
        })
      }
    }
  }
</script>
<style rel="stylesheet/scss" lang="scss">
  .login {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
    background-image: url("../assets/images/login-background.jpg");
    background-size: cover;
  }

  .title {
    margin: 0px auto 30px auto;
    text-align: center;
    color: #707070;
  }

  .login-form {
    border-radius: 6px;
    background: #ffffff;
    width: 400px;
    padding: 25px 25px 5px 25px;

    .el-input {
      height: 38px;

      input {
        height: 38px;
      }
    }

    .input-icon {
      height: 39px;
      width: 14px;
      margin-left: 2px;
    }
  }

  .login-tip {
    font-size: 13px;
    text-align: center;
    color: #bfbfbf;
  }

  .login-code {
    width: 33%;
    height: 38px;
    float: right;

    img {
      cursor: pointer;
      vertical-align: middle;
    }
  }

  .el-login-footer {
    height: 40px;
    line-height: 40px;
    position: fixed;
    bottom: 0;
    width: 100%;
    text-align: center;
    color: #fff;
    font-family: Arial;
    font-size: 12px;
    letter-spacing: 1px;
  }

  .login-code-img {
    height: 38px;
  }
</style>
